On September 7, after more than 200 hours of continuous work, a super-large titanium alloy complex part close to the limit of the equipment forming space was trial-formed in the Additive Manufacturing Center of Kunming University of Science and Technology. This is by far the largest single titanium alloy complex part formed by laser selective melting method.

Laser selective melting is one of the metal 3D printing methods. It uses laser as the heat source to scan the laid metal powder according to the shape data after the parts are separated, so that the metal powder is melted and accumulated point by point to realize the direct manufacturing of metal parts. The metal parts manufactured by this method have excellent mechanical properties, high surface quality and high dimensional accuracy, and are a research hotspot in the field of metal 3D printing. This titanium alloy complex part produced by Professor Li Zhenhua’s research group has a size of 250×250×257 mm, and the total amount of parts and supports exceeds 21 kg.

According to reports, titanium alloys have excellent mechanical properties and corrosion resistance, and are widely used in aerospace, chemical, medical and other fields. In the metal laser 3D printing process, very high residual stresses are generated, stress deformation, cracking and other problems during the forming of complex structural parts have always been the biggest challenges faced by metal 3D printing. When titanium alloy laser 3D printing, these problems are even more serious. protrude. Professor Li Zhenhua and his cooperative team have carried out a lot of preliminary work in powder and composition control, component structure and position optimization, support design and stress release, remote monitoring, etc., and finally determined the test plan, which has accumulated a lot for the completion of the printing of large and complex titanium alloy parts. Valuable experience.

In recent years, the Additive Manufacturing Center of Kunming University of Science and Technology has made great progress in 3D printing research in the fields of aerospace, medical treatment, and molds. At present, more than 5,700 undergraduates enter this manufacturing center each year to study and carry out innovative activities; there are more than 50 professional and technical personnel, doctoral and master students engaged in research in the center.

Link to this article： Successful trial production of super large 3D printed titanium alloy complex parts

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